Texas Instruments Tiva TM4C123GH6PM - Page 257

UART
22.2.1.14 ROM_UARTConfigGetExpClk
Gets the current configuration of a UART.
Prototype:
void
ROM_UARTConfigGetExpClk(uint32_t ui32Base,
uint32_t ui32UARTClk,
uint32_t
*
pui32Baud,
uint32_t
*
pui32Config)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_UARTTABLE is an array of pointers located at ROM_APITABLE[1].
ROM_UARTConfigGetExpClk is a function pointer located at ROM_UARTTABLE[6].
Parameters:
ui32Base is the base address of the UART port.
ui32UARTClk is the rate of the clock supplied to the UART module.
pui32Baud is a pointer to storage for the baud rate.
pui32Config is a pointer to storage for the data format.
Description:
The baud rate and data format for the UART is determined, given an explicitly provided
peripheral clock (hence the ExpClk suffix). The returned baud rate is the actual baud
rate; it may not be the exact baud rate requested or an “official” baud rate. The data
format returned in pui32Config is enumerated the same as the ui32Config parameter of
ROM_UARTConfigSetExpClk().
The peripheral clock is the same as the processor clock. This is the value returned by
ROM_SysCtlClockGet(), or it can be explicitly hard-coded if it is constant and known (to save
the code/execution overhead of a call to ROM_SysCtlClockGet()).
If the peripheral clock has been changed to PIOSC (via ROM_UARTClockSourceSet()), the
peripheral clock should be specified as 16,000,000 (the nominal rate of PIOSC).
Returns:
None.
22.2.1.15 ROM_UARTConfigSetExpClk
Sets the configuration of a UART.
Prototype:
void
ROM_UARTConfigSetExpClk(uint32_t ui32Base,
uint32_t ui32UARTClk,
uint32_t ui32Baud,
uint32_t ui32Config)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_UARTTABLE is an array of pointers located at ROM_APITABLE[1].
ROM_UARTConfigSetExpClk is a function pointer located at ROM_UARTTABLE[5].
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